I am going to try SeaFoam in my gas tank. Anyone else use it? If so how much and how often? Do you think it really helps?

 

I've used it as a fuel additive and spraying directly into the intake. I don't notice anything either time. I had heard spraying into the intake while it's running, you'll see this cloud of black smoke from it burning off the crap in there, but all I saw was a cloud of white seafoam smoke. And, no improvements. Maybe that does happen in a dirty engine, but not on mine.

 

Read the bottle. Follow instructions. Done.

It really is as simple as that.

 

I put 1/2 of a can in at each oil change. I do believe it helps to keep the fuel system clean.

 

It goes directly into my cylinders, why put it in your tank? Put half in your tank and the other half in your engine. Remove the spark plugs and then pour.

 

I think this is really bad advice to put it directly into the cylinders. Especially a half of a can, really?

 

well...I tried seafoam in my blazer before heading in for smog and failed miserably.

High unburned hydrocarbons- about 1200 PPM, standard for the old truck is 500 PPM

post failure I spoke with seafoam who advised i run a couple of tanks of gas through the tank. They said that the seafoam ( about a 1/2 bottle in a 28 gallon tank) could cause lean misfire resulting in the high HC if the seafoam is present at time of testing

a few tanks of gas & I re-tested at about 380 PPM- which is within 10% of historical testing over the past 15 years or so


I won't bother using it again.



Fuel additives to clean the system are EPA mandated- in my vehicles ( young / old, efi/ carbed) I run mostly costco. who claim 5X mandated cleaners.
When replacing fuel pump on my 2001 gmc last year ( 160,000) the fuel tank was completely clear of any deposits dirt dust junk etc- i attribute that to the source of the fuel

mike

 

Read the owners manual.

 

Can said 1 oz per gallon of gas said it would clean valves & pistons with regular use not sure if true or not.
I think I would just use Chevron Premium with Techtron & not buy any additive

 

That's great if you live in a state that has Chevron gas stations. Never seen one around here.